Rear end fluid capacity

Guys

Picked up a 12 Sedan V and I want to change out the read diff fluid. Can anybody tell me the capacity or how much Amsol I'll need to purchase? I'll go by GM and get a small bottle of the limited slip additive also.

Re: Rear end fluid capacity

You need two quarts. I put in about 1.75 quarts when I changed mine last week. Amsoil said you don't need the additive but people have had mixed experiences. I chose to just add the 70ml of additive to avoid messing with it any further. It's been nice and quiet since I changed it (was quiet before too).

You need two quarts. I put in about 1.75 quarts when I changed mine last week. Amsoil said you don't need the additive but people have had mixed experiences. I chose to just add the 70ml of additive to avoid messing with it any further. It's been nice and quiet since I changed it (was quiet before too).

Who at Amsoil? Amsoil HAS CONFIRMED additive is needed for the V2. Not so for the V1.

Re: Rear end fluid capacity

Add the GM friction modifier since it is supposed to be present if you have a rear end warranty claim.
Unfortunately it causes any diff fluid to be more apt to break down since it goes into thermal runaway so
easily. Change the fluid regularly if you engage in Motorsports.

After adding a whole bottle of the GM modifier, I was still getting some rubbing sounds from the diff when I'd turn the first couple times after the car sat. Took it back to the dealer, they swapped the GM fluid back in and all is quiet again.